Physics High School

## Answers

**Answer 1**

The **average force** exerted by the car hood on the water is** 0.875 N.**

What is force?

The definition of **force **in physics is: The push or pull on a massed object changes its velocity.

An **external force** is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude. A spring balance can be used to calculate the Force. The Newton is the SI unit of force.

the **average force** exerted by the car hood on the water

= 0.0250 × 35 × 1 N

= 0.875 N

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## Related Questions

The driver of a car traveling at 27.7 m/s applies the brakes and undergoes a constant

deceleration of 2.81 m/s^2. How many revolutions does each tire make

before the car comes to a stop, assuming that

the car does not skid and that the tires have

radii of 0.18 m?

Answer in units of rev.

### Answers

The answer is 184 I think.

New traits usually occur due to an organism adapting, random genetic mutations, effects from the environment.

### Answers

New traits usually occur in an organism or a population due to random **genetic variations** or mutations. Thus, the correct option is **B**.

What are Mutations?

A **mutation **is a change in the **genetic material **that occurs in the DNA (deoxyribonucleic acid) sequence, either due to the mistakes when the DNA is being copied or as the result of the** environmental factors **such as UV (Ultraviolet) light and cigarette smoke.

**Genetic variations** in an organism can arise from the **gene variants** also called as mutations or from a normal process in which the genetic material is **rearranged** as a cell is getting ready to undergo division known as **genetic recombination**. Genetic variations which alter gene activity or the protein function can introduce different traits in an organism or a complete species.

Therefore, the correct option is **B**.

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Whot is the independent varioble in this experiment?

1. dimples or not

2. the normal car

3. the dimpled car

### Answers

The **independent variable** in this experiment** is dimples or not.**

Option 1 is correct.

What is **independent variable?**

An **independent variable** is defined as the variable that is changed or controlled in a scientific experiment.

In an **experiment**, the **independent variable** is the variable that is varied or manipulated by the researcher. The dependent variable is the response that is measured.

In the dimpled car experiment, we know for a fact that t**he independent variable** ** is dimples or not.**

In the dimpled car experiment, we know for a fact that the dependent variable is Gas mileage.

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If you increase the area over which a force is exerted the pressure will be smaller or bigger?

### Answers

The greater the **force **or the smaller the **area** the greater the pressure.

What is Force?

A force is said to be applied when an object pushes or pulls. The objects' interaction results in push and pull. To describe force, you can also use terms like squeeze and stretch. In physics, a force is defined as:

An object with **mass** experiences a push or pull, which modifies its velocity. The Force can be computed using a spring balance. The SI unit of force is the **Newton** (N).

What is the connection between force and pressure?

Force x Area Equals **Pressure** Without any change in the force, the pressure can be increased and decreased since it depends on the region over which the force is acting. If the force applied remains constant, decreasing the surface will increase pressure, and vice versa.

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vector r with rightwards harpoon with barb upwards on top has a magnitude of 10 meters and is directed at an angle of 45 degrees above the positive x-axis. what are the components rx and ry?

### Answers

The **components** of vector r can be calculated as Rx = 10cos45° = 7.07 meters, and Ry = 10sin45° = 7.07 meters.

What is vector?

**Vector** is a mathematical object that has both magnitude and direction. It can be used to represent **physical quantities** such as velocity, force, acceleration, and more. Vector calculus is used to study and analyze vector fields, which are collections of vectors that each have a location and a magnitude. Vector notation is used to express vectors in concise mathematical equations.

The components of vector r along the x-axis and y-axis are given by Rx = 10cosθ and Ry = 10sinθ.

Therefore, the components of vector r can be calculated as Rx = 10cos45° = 7.07 meters, and Ry = 10sin45° = 7.07 meters.

Hence, the components of vector r with a magnitude of 10 meters and directed at an angle of 45 degrees above the positive x-axis are Rx = 7.07 meters and Ry = 7.07 meters.

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a metal ball-bearing with a circumference of 47.9 mm weighs 15.5 g. what is the density of the metal in g/cm3 (v of a sphere

### Answers

The **density** of the metal of a ball bearing with specified mass and circumference is calculated to be 8.424 g/cm³.

Given that,

Circumference of ball bearing = 47.9 mm = 4.79 cm

Mass of the ball bearing = 15.5 g

We know, **circumference** of the circle = 2 π r

Let us calculate, radius of the ball bearing,

Radius = circumference/2 π = 4.79/2 π = 4.79/6.28 = 0.76 cm

Volume of the sphere = 4/3 π r³ = 4/3 π(0.76)³ = 1.84 cm³

The **expression** for density ρ = m/v

where, m is mass of the ball bearing

v is volume

Density of the metal in g/cm³ = 15.5 /1.84 = 8.424 g/cm³

Thus, the density of the metal is 8.424 g/cm³.

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suppose you have a line graph with kilometers on the y-axis and minutes on the x-axis. if your line indicates that in 2.0 min you travel 0.4 km and in 5.0 min you travel 1.0 km. what is the slope of the line

### Answers

a **graph** is a visual representation or diagram that shows facts or values in an ordered way. The **relationships** between two or more items are frequently represented by the points on a** graph.**

**What is Graph?**

Here, for instance, we can plot a** graph** showing the type and quantity of school supplies used by **pupils** in a class based on the data provided below.

Each supply is first counted, and the data is then shown in a table with specific colors in a** logical order.**

The term **"pictograph" **refers to the visual depiction of information. Each graphic represents a specified number of** objects.** To show how many cricket bats a store sold during a** certain week,** for instance, you could include a picture of a** cricket bat.**

Therefore, a **graph** is a visual representation or diagram that shows facts or values in an ordered way. The **relationships** between two or more items are frequently represented by the points on a** graph.**

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a box that weighs 785 n is lifted a distance of 20.0 m straight up by a cable attached to a motor. the job is done in 6.5 s. what power is developed by the motor in watts and kilowatts?

### Answers

A box that weighs 785 n is lifted a distance of 20.0 m straight up by a cable attached to a **motor.** the job is done in 6.5 s.2415.38 watts **power** is developed by the motor in** watts **.

What is Power?

The quantity of energy transferred or transformed per unit of time is termed as as **power**. Power sometimes is also referred to as activity in ancient writings. A scalar quantity is power.

S.I Unit of Power is **Watt**

Given:

F=785N

d=20.0m

t=6.5s

To find power :

The rate of work would be the deciding factor here. As a result, the work will always equal the force times the **displacement**. Given that the force and displacement are a perfect sine wave, this would be an equal relationship.

Hence, P=Fd/t

putting values

P=785*20/6.5

P=2415.38 watts

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Does ice have zero kinetic energy?

### Answers

The current findings demonstrate that the proton **kinetic energy **in ice is mostly dictated by its zero point value (about 151 meV at T = 5 K), with only a modest **temperature rise** (around 0.02 meV/K between 5 K and 271 K).

**Kinetic energy**, often known as the energy of motion, may be seen in the motion of things and subatomic particles. Kinetic energy may be found in all particles and **moving objects**. Examples of kinetic energy in action include a person walking, a baseball flying through the air, food tumbling off a table, and a charged particle in an** electric field**. Kinetic energy may be calculated as follows: K.E. is defined as the product of the square of the **velocity **and the mass of an object, or m/v2. The kinetic energy is given in kilogram-meter squared per second squared if the mass is measured in kilogrammes and the velocity is measured in metres per second.

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please help me with this question. i really need it

### Answers

a. (i) to determine the distance from the graph is calculate the area in the graph

a. (ii) Calculate the area of triangle, where x = 15 and y = 3. So the distance travelled in the first 15s is [tex]\frac{1}{2}.a.t = \frac{1}{2}.15.3=22.5m[/tex]

b. (i) at 10 s the velocity of train is 2 m/s. The acceleration calculated by [tex]a=\frac{v}{t} =\frac{2}{10}=0.2 m/s^{2}[/tex]

b. (ii) The unbalanced force calculate by [tex]F=m.a = 120.000 . (0.2)=24kN[/tex]

c. Momentum can be calculated by [tex]p=m.v=(120.000).(2)=240.000 \frac{kg.m}{s}[/tex]

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why is a solid substgance able to transport both longitudinal waves and transverse waves, but a homegenous

### Answers

A **solid **substance is able to transport both **longitudinal** and **transverse **waves because it has a rigid structure that can support both types of waves.

**what are longitudinal waves ?**

**Longitudinal waves**, also known as **compressional waves**, are a type of **mechanical wave **in which the particles of the medium through which the wave is passing **vibrate** **parallel **to the direction of **wave propagation**. In other words, the disturbance in the medium is along the direction of wave travel. Examples of **longitudinal** **waves **include sound waves in **solids**, **liquids**, and **gases**.

A **solid substance** is able to transport both **longitudinal **and **transverse **waves because it has a rigid structure that can support both types of waves. **Longitudinal **waves are characterized by particles **vibrating **parallel to the direction of wave **propagation**, while **transverse** waves have particles **vibrating perpendicular** to the direction of **wave propagation**. This ability of **solid substances** to support both types of **waves **is due to the **molecular bonds** in **solids**, which are strong and tightly packed. On the other hand, a **hom*ogeneous **substance, such as a **liquid **or **gas**, has weaker **molecular bonds **and is therefore not as rigid, making it less able to support the **propagation **of both **longitudinal **and **transverse** **waves**.

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a subway train starts from rest at a station and accelerates at a rate of 1.60 m>s2 for 14.0 s. it runs at constant speed for 70.0 s and slows down at a rate of 3.50 m>s2 until it stops at the next station. find the total distance covered.

### Answers

1796.48 m is the the total **distance **covered when a subway train starts from rest at a station and** accelerates** at a rate of 1.60 m>s2 for 14.0 s. it runs at constant speed for 70.0 s and slows down at a rate of 3.50 m>s2 until it stops at the next station.

What is distance?

Distance is a measurement of how far apart two things or points are, either numerically or occasionally as well as qualitatively. Distance may refer to a** physical length **in physics or to an estimate based on other factors in common usage.

Given:

accelerates at a rate of 1.60 m>s2

t1= for 14.0 s

constant speed for 70.0 s

slows down at a rate of 3.50 m>s2

now to find the total distance covered first we need to find the

s1 = a/2 * t1^2 = 0.5 * 1.6 * (14 s)^2 = 156.8 m

v = a * t1 = 1.6 * 14 s = 22.4 m/s

Steady progress:

s2 = v * t2 = 22.4 m/s * 70 s = 1568 m

Deceleration:

t3 = Δv / a = -22.4 m/s / -3.5 m/s^2 = 6.4 s

s3 = v * t3 - a/2*t3^2 = 22.4 m/s * 6.4 s - 0.5*3.5 m/s^2 * (6.4 s)^2 = 71.68 m

S=s1+s2+s3

S=156.8+1568+71.68

S= 1796.48 m

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What is the change in entropy of the system when the flask of hexanes is boiled?

Need a refresher? Head over to action and review Thermodynamics

A.Negative

B.Zero

C.Positive

### Answers

** Positive change in entropy **of the system when the flask of hexanes is boiled.

In this case, Option C is correct

**What is thermodynamics?**

Thermodynamics is the branch of physics that deals with the relationship between **heat and other forms of energy**. It studies how energy is converted into different forms, and how it affects matter and life. It also examines the laws which govern energy transfer and the resulting changes in matter. Thermodynamics is a key part of understanding many natural phenomena, such as the flow of **heat** through the Earth's atmosphere and oceans, and the behavior of stars and galaxies.When a flask of hexanes is boiled, the entropy of the system increases. This is because the **boiling** of the hexanes causes the molecules to become more disordered and spread out, increasing the number of microstates in the system. This is the opposite of what would happen if the flask were to be cooled, in which case the entropy of the system would decrease. Thus, the change in entropy of the system when the flask of hexanes is boiled is positive.

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1. What is absolute zero?(1 point)

Zero on any temperature scale.

The coldest achievable temperature for a given substance.

The temperature of outer space.

The point at which particle motion completely stops.

2. If hydrogen could be held at absolute zero, what would its form be?(1 point)

Liquid

Superfluid

Solid

Gas

3. As researchers cool a substance close to absolute zero, what happens?(1 point)

The work needed to cool it further decreases, becoming easier.

The work needed to cool it further falls to zero.

The work needed to cool it further increases.

Work is done on the environment by the substance.

4. Why can’t absolute zero be achieved?(1 point)

Technology isn’t capable of it yet.

Supercold superfluids have no friction.

We can’t describe an absolute value of cold.

It would require infinite work done on the substance.

### Answers

**Absolute zero** is the temperature at which the atoms in an object stop moving and thus cannot get any colder.

What is the form of hydrogen at absolute zero?The Dihydrogen or Hydrogen molecule (H2) contains 75% Ortho and 25% Para hydrogen at room temperature. The percentage of ortho hydrogen decreases as temperature decreases, while the percentage of para hydrogen increases. So, at 0Kor absolute zero, only **para-hydrogen** exists.All motion comes to a halt at absolute zero. A lower temperature is obviously not possible because there is no velocity less than zero and no **energy **content less than nothing.Absolute zero is unattainable. The reason has to do with the amount of work required to remove heat from a substance, which increases significantly as you try to go colder. It would take an infinite amount of effort to reach zero kelvins.

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a lithium nucleus consisting of 3 protons and 4 neutrons accelerates to the right due to electric forces, and the initial magnitude of the acceleration is

### Answers

The direction of the **electric fields** will be outwards or away from the the carbon nucle.

**Define initial magnitude of the acceleration ?**

Acceleration (a) is the **change in velocit**y (Δv) over the change in time (Δt), represented by the equation a = Δv/Δt.Initial acceleration of a particle moving in a straight line is do and initial velocity is zero. The acceleration reduces continuously to half in every to seconds.

The unit for the magnitude of acceleration is meters per second squared. Because acceleration deals with velocity and time, it is important that the units reflect both **variables.** Velocity is a vector, meaning it has both magnitude and the direction of that magnitude.

To calculate the magnitude of the velocity at any point in time, multiply the constant acceleration rate times the time difference and then add it to the initial velocity. As an example, if you dropped a rock off a cliff, its velocity increases by 32 feet per second, every second.

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The probe used in a medical ultrasound examination emits sound waves in air that have a wavelength of 0. 12 mm. What is the wavelength of the sound waves in the patient?a) 0. 54 mm b) 0. 12 mm c) 0. 26 mm d) 0. 027 mm

### Answers

The **wavelength **of the sound waves in the patient is 0.54 mm.

We can find frequency v = fλ

f = 340 / 0.00012

f = 2833333.3 Hz

By using v = fλ again

Wavelength is equal to 0.54 mm.

When an object is heated it radiates energy. We have all seen and felt this phenomenon. Some **radiation **cannot be seen by us, but we can feel it; a wood burning stove radiates infrared light.

We can feel the heat from the stove, and a simple experiment demonstrates that the heat we feel comes from **light waves**. To stop the heat you only have to hold an object between your face and the stove. As objects get hotter they glow like the burner of an electric stove. As objects continue to be heated they glow brilliantly like the tungsten filament in a light bulb.

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Will pendulums at higher heights go faster or slower?

### Answers

**Pendulums **at higher heights will have a greater potential energy and will therefore go faster. The **potential energy** of a pendulum is directly proportional to its height above its lowest point.

A **pendulum's **potential energy will rise when it is elevated to a higher altitude. This is due to the **pendulum **being drawn towards the Earth's center by the force of gravity acting on it. The gravitational force acting on the pendulum increases with height above its lowest point, increasing its potential energy. Potential energy is transformed into **kinetic energy**, or the energy of motion, when the pendulum is released. The kinetic energy will be transformed back into **potential **energy and vice versa when the pendulum **swings back and forth**. The pendulum will swing faster and for a longer amount of time due to the rise in potential energy.

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Match each plant structure to its function.

trichome

stoma

chloroplast

roots

Options

allows gases to enter and exit the plant

absorbs water and nutrients from soil

converts water and carbon dioxide to sugar

collects water and nutrients from air

### Answers

Water, nutrients, and photosynthates are transported throughout the plant due to the **structure of the plant's** roots, stems, and leaves.

What are the major parts of plant structure and its functions?Trichomes help plants grow and develop by protecting them from UV light, insect predation, and excessive transpiration.A **stoma **is a small opening in the abdomen used to empty waste from the body, such as feces and urine, into a collection bag. You may require a stoma for a variety of reasons, including having a section of your bowel removed.Photosynthesis and oxygen-release processes in **chloroplasts **generate energy, which supports plant growth and crop yield. Chloroplasts are therefore in charge of the biosynthesis of active compounds such as amino acids, phytohormones, nucleotides, vitamins, lipids, and secondary metabolites.The primary function of the root is to absorb water and dissolved minerals and transport them to the stem, as well as to store reserves.

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the hydraulic oil in a car lift has a density of . the weight of the input piston is negligible. the radii of the input piston and output plunger are and 0.125 m, respectively. what input force f is needed to support the 24 500-n combined weight of a car and the output plunger, when (a) the bottom surfaces of the piston and plunger are at the same level, and (b) the bottom surface of the output plunger is 1.30 m above that of the input piston?

### Answers

First, we need to find the **area **of the input piston and output plunger. The area of a circle is given by the formula:

A = πr^2

Where:

A = area

r = radius

π= 3.14

The area of the** input piston**:

A = π(0.100 m)^2 = 0.0314 m^2

The area of the **output plunger**:

A = π(0.125 m)^2 = 0.0491 m^2

Now we can use the area of each piston and the density of the **hydraulic **oil to find the force needed to support the weight of the car and the output plunger. The force is given by the formula:

F = pghA

Where:

F = force

p = density of the hydraulic oil

g = acceleration due to gravity (9.8 m/s^2)

h = height of the fluid

A = area of the piston

(a) If the bottom surfaces of the piston and plunger are at the same level, h = 0 m, so the **force **needed is:

F = pghA = (0.9 × 9.8 × 0) x (0.0314 m^2) = 0 N

So no force is needed to support the weight of the car and the output plunger when the bottom surfaces are at the **same level**.

(b) If the **bottom surface** of the output plunger is 1.30 m above that of the input piston, the force needed is:

F = pghA = (0.9 × 9.8 × 1.3) x (0.0314 m^2) = 39.42 N

So a force of** 39.42 N** is needed to support the weight of the car and the output plunger when the bottom surface of the output plunger is 1.30 m above that of the input piston.

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Explain You pull open a door. If the force

the door exerts on you is equal to the

force you exert on the door, why do you

not move?

### Answers

Explanation: the force of the door on your hand is not the same as just the force of your hand

1. What is absolute zero?(1 point)

Zero on any temperature scale.

The coldest achievable temperature for a given substance.

The temperature of outer space.

The point at which particle motion completely stops.

2. If hydrogen could be held at absolute zero, what would its form be?(1 point)

Liquid

Superfluid

Solid

Gas

3. As researchers cool a substance close to absolute zero, what happens?(1 point)

The work needed to cool it further decreases, becoming easier.

The work needed to cool it further falls to zero.

The work needed to cool it further increases.

Work is done on the environment by the substance.

4. Why can’t absolute zero be achieved?(1 point)

Technology isn’t capable of it yet.

Supercold superfluids have no friction.

We can’t describe an absolute value of cold.

It would require infinite work done on the substance.

### Answers

The **correct **answers are:

Absolute zero is option A:The **coldest **achievable temperature for a given substance.SolidThe work needed to cool it further increases.It would require **infinite **work done on the substance.What is the temperature scale?

Absolute zero is the coldest **temperature **possible, the point at which the thermal motion of all particles comes to a complete stop. At absolute zero, hydrogen would be in a solid form

As researchers cool a **substance **close to absolute zero, the work needed to cool it further increases as the substance gets closer to absolute zero.

Therefore, **Absolute **zero cannot be achieved because it would require infinite work done on the substance, which is impossible according to the Third Law of Thermodynamics.

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what are three reasonable ways the experimenter could improve upon these measurements using the same apparatus, in order to reduce the uncertainty in the resulting period values?

### Answers

**Test** and Collect Data, Select a** Better **Calibration Laboratory, **Remove **Bias and Characterize could be three reasonable measures

For any experiment, a need to keep in mind that the data that you collected must be tested or** verified **which means for the best answer one needs to get the best or clear input that is input in the case of experiments. And collect relevant data only for the output to preside.

The second way could be the **workplace** or laboratory need to be a calibration Laboratory so the experiments could be conducted without ant external disturbance along with the required equipment to make the work easy and faster.

last but not least one need to select** unbiased** and characterized types of equipment which reduce the margin of error from the output we are providing

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Genotype refers to the ________ of an individual.

a.Actual physical appearances

b. Dominant allele

c. Genetic makeup

d. Recessive allele

### Answers

**Answer: **

c. Genetic makeup

**Explanation:**

A genotype is the genetic makeup of an individual organism. Biologists use the term genotype to distinguish from phenotype, which consists of the observable characteristics of an organism.

**Answer:**

c. Genetic makeup

**Explanation:**

**Genetics** refers to studying heredity and the passing of characteristics.

**Genotype**

The genotype of an organism is the organism's **genetic makeup**. It refers to the **alleles** that an organism has. So, the genotype of an organism can describe the specific **genes** of that organism or the gene's location. Genotype can be used to show whether an organism has **dominant** or **recessive** alleles.

**Phenotype**

Often confused with genotype, **phenotype** describes the **physical appearance **of an organism. The genotype of an organism determines the phenotype, but they are not the same.

For example, the genotype of an organism might be "BB" where "B" represents the brown eyes allele. However, the phenotype would be brown eyes. For the most part, phenotype can be described without the use of scientific experimentation because it is visible. On the other hand, determining genotype requires more scientific processes.

a 2 kg bowling ball travelling at 4 m/s hits a stone wall and stops. what is the impulse acting on the bowling ball? kg*m/s

### Answers

The **impulse **acting on the **bowling ball **is - 6kg m/s

An object's** impulse **can be defined as the amount by which its **momentum** shifts as a direct result of a force being applied to it for a certain amount of **time**. To calculate impulse, we can use this following formula:

Impulse = Δp = p final – p initial

Where,

Δp = the change in momentum

Pfinal = the final momentum

Pinitial =the initial momentum

Hence, the impulse:

Δp = pf – pi

Δp = m x vf – m x vi

In this case, we are given that:

the **mass** of the bowling ball (m) = 2 kg

the **velocity **before it hits the stone (vi) = 4 m/s

the velocity after it hits the stone (vf) = 0 m/s (since the ball stopped)

So,

Δp = (2.0 kg) (0. m/s) – (2.0 kg) (4.0 m/s)

Δp = -6 kg m/s

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A 9 kg cat is running 4 m/s. How much kinetic energy does it have?

### Answers

**Kinetic energy** of a moving body can be determined using mass and velocity. Kinetic energy of the cat of **mass** 9 kg and** velocity** of 4 m/s is 72 J.

What is kinetic energy?

The** kinetic energy** of an object is the energy generated by virtue of its motion. It is related to its **mass** and velocity by the expression written below:

Ke = 1/2 m v²

Thus, **kinetic energy** increases with mas and** velocity**. When the body starts moving from rest, its potential energy converts to kinetic energy.

Given that, **mass** of the cat = 9 kg

**velocity** of the ball = 4m/s

then Ke = 1/2 × 9 kg × 4 m/s × 4 m/s = 72 J

The **energy** of the body when it is moving is in the form of kinetic energy.

Hence, the** kinetic energy** of the cat is 72J.

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1. Positive feedback differs from negative feedback because _____.A. positive feedback is generally beneficial while negative feedback is typically harmful.B. positive feedback tends to enhance the triggering stimulus while negative feedback tends to return the body to a homeostatic balance or "ideal" level.C. positive feedback is critical to health while negative feedback serves only to alert us to potential health threats.D. positive feedback provides moment-to-moment well-being while negative feedback causes a cascade effect.

### Answers

Positive feedback differs from negative feedback because positive feedback tends to enhance the triggering** stimulus** while negative feedback tends to return the body to a** homeostatic balance** or "ideal" level.

In brief:

**Positive feedback** increases the initial cause of action or the initial stimulus and repeating the course of action that is started because of the stimulus while **negative feedback** reduces the initial stimulus, thus bring the body back to normal.

What is stimulus?

Stimulus is an external signal to which the body responses.

What is homeostatic balance?

Homeostasic balance is the body's tendency to regulate and maintain internal conditions such as temperature, metabolism etc

What is positive feedback?

It is the amplification of an effect by its own influence on the process which gives rise to it.

What is negative feedback?

It is the negative regulation of an effect by its own influence on the process that gives rise to it.

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the potential energy of a particle experiencing a certain kind of force is given by u of x is equal to 2 times x plus 8 over x measured in joules (j), for positive values of x. what is the minimum potential energy this particle can have?

### Answers

The minimum **potential energy **that the **particle **can have is 8J.

What is potential energy?

**Potential energy **is energy stored in an object due to its position or configuration. It is energy that is waiting to be released and can be converted into other forms of energy. Examples of potential energy include the energy stored in a **compressed spring**, the energy of a raised weight, the energy of an object at the top of a hill, and the energy of a charged battery. Potential energy can be converted into **kinetic energy**, which is the energy of motion.

This is because, for positive values of x,

the smallest value of x = 1.

Thus, when

x = 1, the formula for **potential energy**,

u of x = 2x + 8/x,

becomes

u of x = 2 × 1 + 8/1 = 8 J

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What is the connection between global warming and climate change ?

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**Global warming** refers to the warming of the earth due to holes in the **ozone** layer. The ozone layer protects the earth from harmful ultraviolet rays emitted by the sun. This phenomenon causes our planet to warm and this concept is called global warming leading to climate change.

Global warming refers to an increase in the temperature of the earth, mainly due to an increase in the concentration of greenhouse gases in the atmosphere. “**Climate change**” refers to gradual changes in climate policy over time, including precipitation, temperature, and wind patterns. The burning of fossil fuels, deforestation, and livestock farming are increasingly impacting the planet's climate and temperatures. This adds enormous amounts of greenhouse gases to those naturally present in the atmosphere, increasing the greenhouse effect and **global warming.**

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In triangle jkl, sin(b°) = three fifths and cos(b°) = four fifths. if triangle jkl is dilated by a scale factor of 2, what is tan(b°)? triangle kl in which angle k is a right angle and angle l measures b degrees tan(b°) = five thirds tan(b°) = four thirds tan(b°) = three fourths tan(b°) = five fourths

### Answers

The tanb° of **triangle **jkl is 3/4, that is,** three forth.**

What is trigonometry?

In the field of mathematics known as **trigonometry**, correlations between angles and length ratios are studied.

**Trigonometry **has a wide variety of identities. With the intention of simplifying an expression, finding a more practical form of an expression, or solving an equation, these **trigonometric **identities are frequently employed to rewrite **trigonometrical **expressions.

Given that

sin(b°) = three fifths and cos(b°) = four fifths.

**sinb**° = 3/5

cosb° = 4/5

So, **tanb**° = sinb°/cosb°

=( 3/5)/(4/5)

= 3/5 × 5/4

= 3/4

Hence, tanb° of **triangle **jkl is 3/4.

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The muscles in the human body that are connected to bones and aid in the movement of the.

### Answers

The **muscles** in the **human body** which connect to bones and aid in the movement are called the skeletal muscles.

**Skeletal muscle**, also called voluntary muscle, is the most common of the three muscle types found in vertebrates. Skeletal muscles are attached to bones by tendons and generate all movements of body parts in relation to each other. Skeletal muscle makes up 30-40% of the body. They are muscles that connect to bones and allow them to perform various movements and functions. Skeletal muscles are voluntary. This means you can control when and how it works. Two muscles, flexors, and extensors are involved in **bone movement.**

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